/*
* Copyright 2002-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.security.config.authentication;
import org.springframework.security.core.userdetails.UserCache;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.cache.NullUserCache;
import org.springframework.util.Assert;
/**
*
* @author Luke Taylor
* @since 2.0
*/
public class CachingUserDetailsService implements UserDetailsService {
private UserCache userCache = new NullUserCache();
private final UserDetailsService delegate;
CachingUserDetailsService(UserDetailsService delegate) {
this.delegate = delegate;
}
public UserCache getUserCache() {
return userCache;
}
public void setUserCache(UserCache userCache) {
this.userCache = userCache;
}
public UserDetails loadUserByUsername(String username) {
UserDetails user = userCache.getUserFromCache(username);
if (user == null) {
user = delegate.loadUserByUsername(username);
}
Assert.notNull(user, "UserDetailsService " + delegate
+ " returned null for username " + username + ". "
+ "This is an interface contract violation");
userCache.putUserInCache(user);
return user;
}
}